Buffing machine



W. T. MlNETT BUFFING MACHINE June 6, 1933.

2 Sheets-Sheetl Filed Jan. l2, 19294 /A/ VEN m5'.- l

W. T. MINETT BUFFING MACHINE June 6, 1933.

Filed Jan. l2, 1929 2 Sheets-Sheet 2 Patented June 6, 1933 UNITED STATES4PATENT 'OFFICE WILFRID THOMAS MINETT, OF LEICESTER, ENGLAN'D, ASSIGNORT0 'UNITED SHOE MACHINERY CORPORATION, OF PATTERSON, NEW JERSEY, A.CORPORATION OF NEW JERSEY BUFFING- MACHINE Application led January 12,1929, Serial No. 332,164, and in Great Britain January 17, 1928.

This invention relates to buffing or scouring machines and is hereinillustrated as embodied in a machine, for buifing or scouring shoebottoms, of the type shown in United States Letters Patent No.1,157,725, granted October 26, 1915 upon the application of William A.Reed and James Foley, wherein the abrading action is effected by meansof a cylindrical roll Which is rotated and is also reciprocated axially.

It has been found, particularly in treating shoe bottoms, that asuperior finish is imparted to the surface of the Work and that the lifeof the abrasive covering of the roll is prolonged if a longitudinalreciprocation is imparted to the roll as it is rotated so that there isno opportunity either for the Work to contact 'with the samecircumferential portion of the roll for any great length of time or forany particle of abrasive of undue size' to make a scratch upon the Work.Accordingly, machines of this type have been arranged so that the shaftcarrying the buffing rolls is given an axial reciprocation at arelatively sloW speed While the shaft is rotated at high speed (forexample, from three to four thousand revolutions per minute). Inasmuchas the shaft carrying such rolls must be of substantial size andiweight,it will be evident that unless adequate lubrication is provided, wearwill rapidly ensue and that such Wear will be accompanied not only bynoise but also by vibration which will be detrimental to theproduction'of a good quality of Work.

One of the objects of the present invention is to provide an improvedmachine having a mechanism for reciprocating the shaft which mechanism,by reason of its compactness, may

be enclosed in a housing which contains lubricant.

To this end and in accordance With one feature of the invention, theillustrated machine is provided with a collar carried upon a shaftcarrying a bufiing roll, the collar having an annular guidevvay, such asa slot, disposed in a plane inclined to the axis of the shaft, a gimbalring surrounding the collar, means engaging the guideway and connectedt0 said gimbal ring for reacting upon said collar to the collar to theshaft.l In the illustratedv machine, the gimbal ring is mounted upontrunnions having an axis which intersects the axis of the shaft, and theguideWay-engaging means is connected to the gimbal ring by trunnionshaving an axis offset from the axis of the shaft. The collar and themeans cooperating therewith may be compactly arranged Within a housingcontaining lubricant.

In accordance With another feature of the invention improved meansactuated by the shaft are provided for supplying lubricant to themechanism which reciprocates the shaft axially. As illustrated, means isprovided for supplying lubricant to a cylinder in which the 'shaftreciprocates, and the plunger-like action of the shaft forces thelubricant from the cylinder through a passage in the shaft itself to theengaging surfaces of the shaftvand the means for reciprocating theshaft. The above and other features of the invention, including detailsof construction, will now be more particularly described with referenceto the accompanying drawings, in which:

Fig. 1 is a general view in perspective of a machine embodying theinvention in a preferred form:

Fig. 2 is an enlarged vertical sectional view of shaft reciprocatingmechanism, taken through the axis of the hui'ng roll shaft illustratedin Fig. 1; and

Fig. 3,is a transverse sectional view taken on the line III-III of Fig.2.

The illustrated machine for treating the bottoms of shoes, shown as awhole in Fig. 1, comprises a frame 10 provided with bearings 12, 12 fora shaft 14 upon which the buffing rolls 15, 15 are mounted, the spacingof the rolls from the bearings being such that axial reciprocation ofthe shaft is permitted. Associated with the elongated cylindricalbuffing rolls are hoods 17, 17 and dust-collecting 'a housing 22.

the final buiiing upon both the treads and the shank portions of thebottoms, the machine is also provided with pads 23, v23 of the wellknownNaumkeafr type, the pads being rotatable about uprigilit forwardlyinclined axes and positioned just above the scouri rolls 15 so that theyare accessible for useily the operator without-any substantial change instance. Tlie machine is also provided with a pressure pump 25 of thetype illustrated in United States Letters Patent No. 822,154 granted May29, 1906 upon the application of A. W'. Rogers for supplying air underpressure to the Naumkeag pads 23, 23. Power for rotation of the builingtools 15, 15 is derived from a drive shaft 20 at the base of the machinewhich is connected to the shaft 14 by means of a belt 18 running over apulley 16 on said shaft.

In order that the shaft 14 carrying the buffing rolls may bereciprocated during its rotation, novel mechanism is provided, which isincluded within and largely concealed by This housing 22 is bolted tothe frame adjacent to and surrounding the left-hand end of the shaft 14.A collar 24 (Fig. 2), extending within the housing 22, is carried uponthe shaft 14 and is freely rotatable with respect thereto, the collar 24being driven by a pulley 26 keyed to the collar 24 upon a hub 27 whichextends outside the housing 22. The pulley 26 is driven at a slower ratethan the shaft 14 by abelt 28 from the drive shaft 20. The opposite endof the collar 24 within the housing 22 acts upon the shaft 14 through adouble thrust bearing 30 carried by the collar 24 to transmit anylongitudinal movements of the collar 24 to the shaft 14. The portion ofthe collar 24 between the thrust bearing 30 and pulley 26 is enlargedand has formed in it an annular guideway in the form of a slot 32 ofsquare cross section, the annular slot 32 bei concentric with the axisof the shaft 14, while the plane of the slot 32 is inclined to the axisof the shaft 14. Surrounding the collar 24 is a gimbal ring 34 supportedby a fixed fulcrnm in the form of diametrically opposed externalhorizontal trunnions 36 (Figz 3). mounted to fit freely in bearings 38in the sides of the housing 22, the axis of the trunnions 36 beingperpendicular to and intersecting the axis of the shaft 14. rihe gimbal'ring 34 is connected by a second pair of coaxially opposed trunnions 40extending inwardly from the gimbal ring 34 to a block 42 which is in theform of a ring mounted to slide within and fitting the slot 32. The axisof the trunnions 40 is perpendicular to and intersects the axis of thetrunnions 36. rlhe block 42 does not form a complete annulus butlias agap cut in it to allow its being assembled over the collar 24, as shownin Fig.

3. The axis of the trunnions 40 (Fig. 3) is ofset from the axis of theshaft 14 so that on the rotation of the collar 24 the block riri 42 willcause the gimbal ring 34 to oscillate a out -24 would have no effect atall upon the axial position of the shaft 14. However, inas much as theaxis of the trunnions 40, and therefore the fixed point of intersectionof the axes of the two sets of trunnions, is oset from the axis of theshaft 14, a reaction will be set up between the trunnions of the gimbalring 34, which trunnions are journaled in the housing 22, and therotating collar 24. This will cause the collar 24 to reciprocate alongthe axis of the shaft 14, and such reciprocation of the collar 24 willbe transmitted to the shaft 14 through the double thrust bearing 30,causing the shaft 14 to oscillate axially. That such must be the casewill be evident when it is considered that the block ring 42 is confinedto rotation about the axis of the trunnions 36 and also about the axisof the trunnions 40. The block ring 42 is thus confined to movementabout the intersection of the axes of the two sets of trunnions. Thisintersection, being in the fixed axis of the trunnions 36, is a fixedpoint. The rotation of the collar 24, with its inclined guideway 32,will cause the block ring 42 to oscillate about the above-mentionedintersection of the trunnion axes as a fixed center. Since this fixedcenter lies outside of the axis of the collar 24, the component ofoscillatory movement of the block ring 42 which is in line with the axisof the collar 24 will be transmitted to the collar 24; in other words,the collar 24 will be reciprocated along its own axis.

lnuorder to provide for lubrication of the above-described mechanism, aWell 44 is formed in the bottom of the housing 22. A chain 46 carriedupon the shaft 14 adjacent to its end dips into the Well 44 and picks upoil which it delivers to a helical groove 48 formed in the shaft 14 andextending from a point adjacent to the chain 46 to the adjacent end ofthe shaft 14. That end of the shaft 14 is received within a cylindricalrecess in a block 50, hereinafter termed a cylinder, which is mounted onthe end wall of the housing 22. An axially disposed passage 52 extendsthrough the shaft 14 from the end of the shaft 14 toward a pointadjacent to the end of the hub-of the collar 24 which extends outsidethe housing 22. IThe passage 52 connects with a radial passage 54 whichin turn connects with a second helical groove 58 in the periphery of theshaft 14 to supply lubricant to the engaging surfaces of the collar24and of the shaft 14. The shaft 14, acting as a plunger by reason ofits reciprocating movement, will force the lubricant which collects inthe. cylinder 50 through the assages 52 and 54 to the groove 58. A cylimrical recess 60 is formed in the collar 24 at the point where the radialpassage 54 emerges. Any excess of lubricant delivered through thepassage 54 will be collected in the recess (3() from which it willreturn to the interior of the housing 22 through a passage (i2 in thecollar 24. Air which might otherwise be trapped in the passages 52 and5l will also escape through the recess 60 and the passage (32.

For lubricating the trunnions 36, oil holes 64 (Fig. 3) are provided inthe bearings 38. A pair of downwardly sloping rods 66 (Fig. 2) are eachsupported at one end from the upper wall of the housing 22. The loweropposite ends of the rods 66 terminate directly above the oil holes 64.The rotation of the collar 24 will cause the oil within the housing 22to splash and some of the oil which is thus splashed will collect uponthe rods 66 and will thus be conducted to the lower ends of the rods 66from which the oil will drop into ,the oil holes 64 to lubricate thetrunnions.

Having thus described my invention, what I claim as new and desire tosecure by Letter.; Patent of the United States is:

1. In an abrading machine, a shaft mounted for axial movement, means forrotating said shaft, a collar carried upon said shaft and having anannular guideway disposed in a plane inclined to the axis of said shaft,means for rotating said collar, a fixed fulcrum having an axis whichintersects the axis of said shaft, a gimbal ring pivotally mounted onsaid fulcrum and surrounding said collar, a ring slidably engaging saidguideway, pivotal connecting means between said slidable ring and saidgimbal ring constructed and arranged to cause said slidable ring toreact upon said collar as the latter rotates to reciprocate said collaralong the axis of said shaft, and means for transmitting saidreciprocatory movement of said collar to said shaft.

2. In an abrading machine, a shaft mounted for rotation and for axialmovement for carrying an abrading roll, a collar carried upon said shaftand having an annular guideway disposed in a plane inclined to the axisof said shaft, means for rotating said collar, a gimbal ring surroundingsaid collar, means including a pair of trunnions for supporting saidgimbal ring, means engaging said guideway and including a second pair oftrunnions carried in said gimbal ring, the axes of said pairs oftrunnions being mutually perpendicular and one of said axes being offsetfrom the axis of said shaft, whereby the reaction of said collar againstsaid gimbal ring as the collar rotates will cause reciprocation of thecollar along the axis of said shaft, and means for imparting thereciprocation of said collar to said shaft.

3. In an abrading machine, a shaft mounted for axial movement forcarrying an abrading roll, a collar carried upon said shaft and havingan annular guideway disposed in a plane inclined to the axis of saidshaft, means for rotating said collar, a gimbal ring surrounding saidcollar, means including a pair of trunnions having a fixed axisperpendicular to and intersecting the axis of said shaft for supportingsaid gimbal ring, means engaging said guideway and including a secondpair of trunnions carried in said gimbal ring, said second pair oftrunnions havin r an axis which is perpendicular to the axis of thefirst said pair of trunnions and which is offset from the axis of saidshaft, whereby the reaction of said collar upon said gimbal ring as thecollar rotates will cause reciprocation of the collar along the axis ofsaid shaft, and means for transmitting the reciprocation of said collarto said shaft.

4. In an abrading machine, a horizontal shaft mounted for rotation andfor axial movement, means for reciprocating said shaft, a cylinderwithin which an end portion of said shaft reciprocates, said shafthavinga groove in its periphery for conducting lubricant to the interior ofsaid cylinder and having also an internal passage for conducting to apoint of use the lubricant forced from said cylinder by the plungeraction of said shaft, and means for supplying lubricant to saidperipheral groove in said shaft.

5. In a machine for buiiing boot and shoe bottoms, a horizontal shafthaving a projecting end portion, a housing mounted on the frame of themachine and surrounding said end portion, said housing being constructedand arranged to hold a liquid lubricant, mechanism within said housingfor imparting an axial reciprocation to the shaft including a drivencollar rotatable upon the shaft and having a hub portion extendingthrough the housing adjacent to the shaft, driving means for said collarassociated with said projecting hub portion, and means within saidhousing for conducting the lubricant to the parts of said mechanismwhich require lubrication.

6. In an abrading machine, a shaft mounted for rotation and for axialmovement, means carried upon said shaft and movable relatively theretofor reciprocating said shaft. a cylinder for receiving one end of saidshaft, and means for supplying lubricant to the interior of saidcylinder, said shaft having a passage to permit the ioW of lubricantfrom said cylinder to the engaging surfaces of said shaft and saidreciprocating means, whereby lubricant is forced from said cylinderthrough said passage by the plunger action of said shaft in itsreciprocating movement.

7. A machine having, in combination, a housing the lower portion ofwhich forms a reservoir for lubricating oil, a. shaft mounted for rotaryand axial movement, a collar carried by the shaft and dipping into andsplashing the oil in the reservoir, said collar` having an annularguidewayy disposed in a planey y vinclined to the axis of the shaft,means for rotating said collar, a gimbal ring surrounding said collar, apair of trunnions having a fixed axis perpendicular to the axis of theshaft and su porting` said gmbai ring, a second pair o trunnions carriedby said gimbal ring and having an axis perpendicular to the axis of thefirst pair of trunnions and offset from the axis of the shaft, a membercarried by the second pair of trunnions and 'positioned in the guidewayof the collar whereby the rotation of the collar causes re ciprocationof the collar am'ally of the shaft, means for transmitting reciprocationofthe collar to the shaft, and means within the housing for collectingsome of the oil splashed by the collar and conducting it to parts of theshaft reciprocating mechanism which require lubrication.

8. A11 abrading nation, a shaft, earings in which machine having, incombithe shaft is mounted for rotary and amial movement,

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means for rotating the shaft, means for reciprocating the shaft., saidshaft being provided with an axial oil hole and the surface of the shaftbeing supplied with an oil groove both communicatin with a chamberreceiving an end of the s aft, and vmeans for supplying oil to saidgroove by which itis transmitted to the chamber whereby reciprocation ofthe shaft forces the oil from the chambery through the axial oil hole ofVthe shaft to parts Which require lubrication.

ln testimony whereof f have signed my name to this specication'.

missin Thomas im.

